I have T=62 N=14 panel. so I want to use ARDL model, but after -ardl depvar indepvars- I get this result: "sample may not include multiple panels". Is any problem in my data? how can solve this problem?
Hello, I built cox proportional hazard model with time-dependent covariates. when I predict survival probability, it wasn't monotonically decreasing for each ID. what is problem and how to handle...
15 April 2021 6,760 3 View
hello dears, I have just interested in IFRS9 ECL models. I have three question and I appreciate all answers. 1) which models are best for pd, LGD & EAD calculation when I have scarce (about...
04 February 2020 1,416 3 View
I want to check if my time series variable is stationary. with no lag order variable is stationary, but with 1 and more lags order process is non-stationary. what I can conclude: is process...
13 August 2019 6,499 3 View
I have binary classification model. classes are very unbalanced, as I know accuracy is not good metric for unbalanced classification. how do you think which is better metrics? I have following...
26 May 2019 3,555 11 View
I have just found tree models with regression at leafs. There are several models/packages that does something similar, such as M5P, cubist, model trees.... I want to know pros and cons of these...
30 April 2019 8,510 0 View
I am begginer in machine learning. can you provide me with some links to understand how boosting and random forest work and what is pros and cons of these techniques ? also I am interested in...
16 April 2019 2,734 5 View
I have lots of variables and want to select several of them which will be able to explain a great part of variance. I assume PCA is satisfying. Can you recomend me other technique (or any...
15 April 2019 6,864 16 View
I have unbalanced panel data with several problems: serial correlation, heteroscedasticity and cross-sectional dependence. I want to use -xtregar, fe- model in stata to deal with serial...
24 March 2019 5,725 2 View
I have panel data. I employ fe model, but there are heteroskedasticity and serial correlation problems in model. How i can solve this problem? using robust standard errors is apcetable? which...
17 March 2019 3,324 6 View
I want to analyse commercial banks profitability. (I have panel data). I use ROAA as dependent variable and liquidity ratio, capital ratio, NPL, staff-expenses ratio, total asset, non-interest...
16 March 2019 8,731 5 View
I tried four trials of the same Copper Phosphides sample in Alkaline medium ( 0.5M KOH) with Hg/HgO reference electrode and Pt as counter electrode. I used 0.001 V/s scan rate for first three...
10 August 2024 3,629 1 View
We have observed that tube to tube sheet joint leaked in our boiler and needs to overcome same by knowing the root cause.
08 August 2024 3,161 0 View
All plants are green but some of these plants becomes yellow. I did not found any reason. Please help me to find out the real problem.
01 August 2024 589 4 View
Hey All! I am wondering what might be wrong with my band structure. I did the calculations using VASP and plotted the results using Origin. Although I have tried changing various input...
25 July 2024 2,920 11 View
It is being seen that Editors of some reputed Journals are putting on hold the manuscripts and not updating review states even passing more than six months from submission. Researchers are...
24 July 2024 8,596 2 View
Our lab has some radioactive cell samples that need to be kept frozen for at least 30 days before flow analysis. For some reason, the samples stored in liquid nitrogen did not perform as well as...
15 July 2024 9,975 1 View
I performed CV of Cu-MOF in a buffer solution of pH 8, and we did not find any peak corresponding to Cu2+ to Cu+. What is the reason behind this? Please give your valuable suggestions.
08 July 2024 2,388 4 View
What could be the reason for mixotrophs to be yellow too instead of green? Thank you
08 July 2024 594 2 View
I'm currently analyzing the Raman spectra of coloured plastic samples and have encountered a wavy, oscillating pattern in the spectra of some coloured samples. I was wondering what the possible...
04 July 2024 1,949 4 View
Which river basin has the lowest total replenishable groundwater resources and utilization of irrigation potential created lags behind the potential created what are the reasons?
03 July 2024 9,638 0 View